fix(projects): edit-page responsible picker shows only active users (keeps current assignee)

Mirror the create-modal fix on ProjectDetail: filter the 'Zodpovědná osoba'
select to active users (already scoped to projects.view), but keep the
project's currently-assigned user selectable even if inactive, labelled
'(neaktivní)', so the saved value still shows.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/pages/ProjectDetail.tsx

@@ -81,10 +81,18 @@ export default function ProjectDetail() {
   const notes: ProjectNote[] = project?.project_notes || [];
 
   const { data: usersData } = useQuery(userListOptions("projects.view"));
-  const users: User[] = (usersData ?? []).map((u: ApiUser) => ({
-    id: u.id,
-    name: `${u.first_name || ""} ${u.last_name || ""}`.trim() || u.username,
-  }));
+  // Only active users with projects.view — but keep the project's CURRENT
+  // assignee in the list even if they're now inactive, so the select still
+  // reflects the saved value (marked "(neaktivní)" so it's clear).
+  const assignedUserId = project?.responsible_user_id || "";
+  const users: User[] = (usersData ?? [])
+    .filter((u: ApiUser) => u.is_active || String(u.id) === assignedUserId)
+    .map((u: ApiUser) => ({
+      id: u.id,
+      name:
+        (`${u.first_name || ""} ${u.last_name || ""}`.trim() || u.username) +
+        (u.is_active ? "" : " (neaktivní)"),
+    }));
 
   // Reset form sync when navigating to a different project
   const formInitialized = useRef(false);